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Franck-Hertz Experiment
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1)The specific charge of cathode rays 
  

2)Cathode rays are
  

3)Neglecting relativistic change of mass, the wavelength associated with an electron of kinetic energy E is proportional to
  

4)The energy equivalent of 1 u is
  

5)The best material for the emission of electrons in a tube maintained at a lower pressure
  


  


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